Ykdl

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- right way to add requirements

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- add experimental merge feature.
- video titles are changed for many sites.
- longzhu live is improved.
- live video authors are added when possible.
- subtitle feature is planned but moved to danmu branch.

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- bug fix for baomihua
- add test for extractors status.

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- fix unqoute issue in python2, since v1.0.9 is released
- a draft binary release is done. feedback is welcome.

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- new sites are supported

1. huya live and video
2. longzhu live

- python2 are supported

almost done

big change